After his arrest police raided the suspect’s nearby home and found the body of his stepsister, 17. Police have accused him of her murder.

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Prosecutors are seeking to keep Manshaus in custody for four weeks on suspicion of murder and breach of anti-terrorism law.

Manshaus’ defence lawyer Unni Fries declined to comment on Norwegian media reports that posts online suggested the suspect was a far-right extremist inspired by the shootings in Christchurch, New Zealand in March andin El Paso, Texas, on 3 August.

She told the detention hearing that he ‘will use his right not to explain himself for now’.

After the hearing, the lawyer told reporters that her client does not admit to any crime.

Flowers lay outside the home of the 17-year-old stepsister of the suspected Mosque attacker (Picture: AFP/Getty)

Norwegian media reported that Manshaus wrote online on the day of the attack that he had been ‘chosen’ by ‘Saint (Brenton) Tarrant’, the Christchurch gunman.